thomas



(No Model.)

G. G. THOMAS. ART OF MAKING HINGES.

No; 267,809. Patented Nov. 21, 1882.

%- 6' c lllllllllflllllll Mbeasses A UNITED STATES PATENT OFFICE, f

GEORGE G. THOMAS, OF NEW YORK, N.

ART OF MAKING HINGES.

SPECIFICATION forming part of Letters Patent No. 267,09, dated November21, 1882.

Application filed March 16, 1880. (No model.)

formed.

My improvements consist essentially in cutting or punching the blanksfrom sheet metal with the end portions diverging or extending away fromeach other; in then. bending said blanks to bring the end portionsthereof into positions parallel with each other, and in finally bendingthe extremities to form the ears or sockets and uniting the two parts bya pintle or pin.

In the accompanyingdrawings,Figurelr presents a plan of the sheet-metalblank prior to its being bent; Fig. 2 represents a similar view of thesaid blank after being bent transversely of its width, and Fig. 3represents a plan view of the completed hinge.

Similar letters of reference deslgnate corresponding parts in all thefigures.

The blank for forming the leaf or plate of the hinge is first cut orpunched from sheet metal in the form shown in Fig. 1, in which the endportions, A, are diverging or extend away from each other, preferably atan obtuse angle to the central portion, A, and when out or punched inthis form it is obvious that the blank can be cut from the metal side byside without waste, the two opposite sides of the blank being of thesame outline. The end portions, A, arejoined to thecentralportion,A, by

bends or curves at, so shaped that when pressure is properly applied tothe blank it will yield at the said bends or curves and allow the endportions,A, to bend into positions parallel with each other, as shownclearly in Fig 2. In

order to obviate the bending of the metal too much at thebends a, Ipreferably form a similar bend b at the middle of the central portion,A,and when this is done the parts ofthe central portion, A, which areupon each side of the bend b, are bent at an obtuse angle to each other,as shown in Fig. 3. This central bend, b, is, however, not absolutelynecessary; but it has the additional advantage of imparting to the hingean ornamental configuration.

The bending of the blanks transversely may he done by means of a dieprovided with cheeks or side pieces, inclined so as to bend the endportions inward toward each other, and a pusher corresponding in shapewith the outline of the inneredge of the finished blanks. The blanks areforced forward by the pusher, first bending them at the middle bend orcurve, and afterward bending the end portions into a position parallelwith each other.

The blanks, bent into the form represented in Fig. 2, have the ends ofthe portions A shouldered at s, so as to engage properly to form ahinge, and bent over so as to form ears or sockets c forthe reception ofthe pintle oI hinge-pin, d,- and I may provide the hinge with theordinary spiral spring, 6, for autoinai ically closing the door or otherarticle to which the hinge is applied.

It is obvious that blanks of the form shown in Fig.1 maybe cut with muchless waste or metal than it cut out in the form of the finished bentblank shown in Fig. 2, and as such hinges are usually made ofsheet-brass, this saving of material lessens the cost of manul'acturing,and enables hinges to be produced at a cheaper rate, thereby proving a.benefit to the manufacturer and the purchaser.

In lieu of the blank shown in Fig. 1, I may employ blanks in which theend portions, A, extend parallel with the cential portion, A, and aretangential to the bends or curves a.

What I claim as inyinvention, and desire to secure by Letters Patent,is-

1. The improvement in the art of making hinges of sheet metal-s-namely,cutting or parts by a pintle 01' pin-substantially as set forth.

or ears, and uniting the two parts by a pintle or pin, substantially asset forth.

GEO. O. THOMAS.

2. The improvement in the art of making Witnesses CHAS. S. LEWIS, EDWINH. BROWN.

bending the extremities to form the sockets 1

